tokevenGPTvsGrok
GPT 5.5 vs Grok 4.5
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.5
FlagshipGrok 4.5
FlagshipInput $/MTok
$5.00
$2.00
Output $/MTok
$30.00
$6.00
Cache discount
90% off
85% off
Context
1.1M
500K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
65
vs
61
Code Review
90
vs
0
Summarization
70
vs
71
Q&A
90
vs
0
Extraction
78
vs
72
Reasoning
90
vs
87
Classification
85
vs
0
Creative Writing
73
vs
74
GPT 5.5
Grok 4.5
Guidance
When to use GPT 5.5 vs Grok 4.5
Choose GPT 5.5 when...
- -You need strong reasoning (confidence 90 vs 87)
- -You need strong extraction (confidence 78 vs 72)
- -You need strong code generation (confidence 65 vs 61)
- -You need a larger context window (1.1M vs 500K)
Choose Grok 4.5 when...
- -You need strong creative writing (confidence 74 vs 73)
- -You need strong summarization (confidence 71 vs 70)
- -Cost matters: 60% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.5
Grok 4.5
100K tokens
$1.25
$0.32Cheaper
1M tokens
$20.50
$6.40Cheaper
10M tokens
$205.00
$64.00Cheaper
FAQ
When should I use GPT 5.5 instead of Grok 4.5?
GPT 5.5 outperforms Grok 4.5 for Code Generation, Extraction, Reasoning. It costs $5.00/$30.00 per million tokens (input/output).
Is Grok 4.5 cheaper than GPT 5.5?
Yes. Grok 4.5 input costs $2.00/MTok vs $5.00/MTok for GPT 5.5, saving 60% on input.
What are the context window sizes for GPT 5.5 and Grok 4.5?
GPT 5.5 has a 1.1M token context window. Grok 4.5 has a 500K token context window.
Go deeper on either model
Per-call cost calculators, provider lineups, and price history for both models on this page.
Other comparisons
How GPT 5.5 and Grok 4.5 stack up against the rest of the field.
Track your real costs
Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.